Improvement in steam-engines



W H. GARLOOKBL RQOOOKE'.

Steam-Engine ATTO RNEY NPEIERS, PHOTO LITHOGRAPHEE WASHINGTON, D C.

UNITED STATES PATENT OFFICE,

WILLIAM H. GARLOGK AND RICHARD OOOKE, OF DENISON, TEXAS.

IMPROVEMENT IN STEAM-ENGINES.

Specification forming part of Letters Patent No. 217,088, dated July 1,1879 application filed April 1, 1879.

To all whom z'tmay concern:

Be it known-that we, WILLIAM H. GARLocK and RICHARD O0oKE,of Denison, inthe county of Grayson and State of Texas, have invented a new andvaluable Improvement in Self- Working' Steam-Engines; and we do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a vertical longitudinalsection of this invention. Fig. 2 is a side view of the valve and rod.Figs. 3, 4, and 5 are details.

This invention has relation to improvements in steamengines.

The object of the invention is to devise means whereby the valves may beactuated automatically without the employment of exterior mechanisms bythe use of exhauststeam.

The nature of the invention consists in the combination, with a cylinderhaving steampassages and partial-exhaust passages of small size in itswall, and a steam-chest having diverging exhaust-passages, of a valve insaid chest, having two spaced heads provided with extensions or rings,each of the said rings being provided with a main and a partial exhaustport, working in connection with theexhaust-passages of the chest, andwith two ports working in connection with the stcampassages andpartial-exhaust passages of the cylinder, as will be hereinafter fullyexplained.

In the annexed drawings, the letter A designates an ordinarysteam-cylinder, having a piston, B, and piston-rod B, working through astuffing-box, a, in one of the cylinder-heads.

0 represents a valve-box, usually at the top of the cylinder, andgenerally made in two sections, 1) I), joined together by flanges andbolts. The section bis cast with the cylinder, and the box is closed ateach end by means of heads 0. In the top wall of the cylinder are formedthe steam-passages cl d,in line with each other, and opening into thecylinder close to its heads at one end, and into the valve-box O at eachside of the middle of the length of said cylinder. 4

c 0 indicate smaller passages, arranged in the said wall, one at eachside of the passages cl cl, and opening into the cylinder independentlythereof. The passages e e extend from opposite directions past themiddle of the length of the cylinder, and open into the valvebox nearto, but outside of, the passages d d. The top wall of the box isprovided with two converging ducts, f f, having an educt-opening, 0,common to both, and leading into the box in line, or nearly so,with thesteam-passages d d. The object of these passages will be fully explainedhereinafter.

D indicates the valve mechanism, consisting essentially of a shaft, g,extending axially through the box, with one end passing through astuffing box, It, and supported by a guide, It, outside thereof,provided with two spaced heads, I Z, provided each with a cylindricalhollow extension or flange, n, in which are formed on one side the ports41 11, and on the I other side the ports j and j. The ports j supply themain steam-passages (1 cl, and the ports j the partial-exhaust passagesc e, the relative positions of the said ports being the same as that ofthe openings of the passages aforesaid. The extent of movement of thevalve is controlled by means of a shoulder, e, on the valverod g, and,if desired, a stop or collar on the said rod outside of the chest; or wemay depend upon the abutting of the inner end of the said rod againstthe contiguous head of the chest.

The operation of our improved engine is as follows, reference beingespecially had to Fig. 1 of the drawings: Steam is let into the chestthrough an opening, 0, in its wall between the heads of the valve, andpasses through passage 61, the valve-l1eadl being clear of the openingthereof, info the steam-cylinder, forcing the piston in'the directionindicated by the arrow. It beingpremised that the piston has alreadymade a stroke, and that there is steam on both sides thereof, steam isexhausted from the other end of the cylinder through passage (1, andpasses therefrom into the contiguous end of the chest through the port jof the ring a of head I, whence it escapes into the main exhaust-passagef through the portt' of the said head. A portion of the exhaust-steampasses through the partial-exhaust passage 6 and port j of head Z intothe opposite end of the chest, and by its pressure forces the valve awayfrom this end of the chest toward the other end thereof,

the steam in this latter end being exhausted.

through the port 6 of head 1 into the main exhaust-passage f, onlysufficient remaining to cushion the valve and prevent noise. Thismovement of the valve is due to the fact that the partial-exhaust ports*5 are much smaller than the main exhaust-ports i, and that inconsequence steam has free egress through the port i at one end of thevalve-box, but is obstructed in passing through port t" at the other endthereof. By this means an equilibrium of pressure in the valve-case isprevent-ed. This movement throws the valve-head 1 clear of the openingof passage (1 into the chest precisely as shown in Fig. 1 for thepassage (1 and valvehead 1, and steam rushes into the opposite end ofthe cylinder, reversing the movement of the piston. The steam in theexhausting end of the cylinder passes out therefrom through passage d,ports j i of the ring on of head I, and the main exhaust-passage f, aportion, however, passing through passage 0 and port j of head linto theoppositeend of the chest, and reversing the valve as before, theexhauststeam in front of head 1 escaping through the port '13 and maineXhaust-passagef. A regular reciprocating movement of the valve D isthus had, that automatically lets on and cuts off steam from thecylinder Without using eccentrics or other like devices.

What We claim as new, and desire to secure by Letters Patent, is-

In a steam-engine, the combination, with a cylinder having thesteam-passages d d and the reduced partial-exhaust passages e e, of thechest 0, having the diverging exhaust-passages f f and the valve D,having the spaced heads 1 I, provided with rings at, having ports i andi, working in connection with passages f f and ports j j, working inconnection with passages d d and e 6, respectively, substantially asspecified.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

\VILLIAM H. GARLOGK. RICHARD OOOKE.

Witnesses JOHN G. WEsT, JOHN J. WENDORFER.

